EP1153737A2 - Feuille composite respirable et imperméable - Google Patents

Feuille composite respirable et imperméable Download PDF

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Publication number
EP1153737A2
EP1153737A2 EP01303686A EP01303686A EP1153737A2 EP 1153737 A2 EP1153737 A2 EP 1153737A2 EP 01303686 A EP01303686 A EP 01303686A EP 01303686 A EP01303686 A EP 01303686A EP 1153737 A2 EP1153737 A2 EP 1153737A2
Authority
EP
European Patent Office
Prior art keywords
heat
composite sheet
nonwoven fabric
synthetic resin
resin film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01303686A
Other languages
German (de)
English (en)
Other versions
EP1153737A3 (fr
Inventor
Michiyo Technical Center Matsushita
Yasushi Technical Center Atsuta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unicharm Corp
Original Assignee
Unicharm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unicharm Corp filed Critical Unicharm Corp
Publication of EP1153737A2 publication Critical patent/EP1153737A2/fr
Publication of EP1153737A3 publication Critical patent/EP1153737A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51456—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties
    • A61F13/51458—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties being air-pervious or breathable
    • A61F13/51462—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties being air-pervious or breathable being defined by a value or parameter
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51456—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties
    • A61F13/51464—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties being stretchable or elastomeric
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51474—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure
    • A61F13/51478—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure being a laminate, e.g. multi-layered or with several layers
    • A61F13/5148—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure being a laminate, e.g. multi-layered or with several layers having an impervious inner layer and a cloth-like outer layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24843—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] with heat sealable or heat releasable adhesive layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2813—Heat or solvent activated or sealable
    • Y10T428/2817—Heat sealable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/674—Nonwoven fabric with a preformed polymeric film or sheet
    • Y10T442/678—Olefin polymer or copolymer sheet or film [e.g., polypropylene, polyethylene, ethylene-butylene copolymer, etc.]

Definitions

  • This invention relates to a breathable and liquid-impervious composite sheet suitable for use in a disposable wearing article such as an outer gown for surgeon or a patient or nightgown for patient.
  • Japanese Patent Application Publication No. 1998-295724A describes a three-layered breathable and liquid-impervious composite sheet comprising a third fibrous layer of meltblown-nonwoven fabric, and first and second fibrous layers of spunbond- or spunlace-nonwoven fabric and placed upon opposite surfaces of the third fibrous layer.
  • This composite sheet of prior art is embossed by a heat-embossing roll so that the first, second and third fibrous layers are intermittently heat-sealed in heat-sealing regions.
  • This composite sheet of prior art has high flexibility and surface friction strength.
  • the composite sheet disclosed in the Publication has its sheet surfaces being substantially flat and can not be compressively deformed inward in a thickness direction of the sheet enough to ensure a desired elasticity even when compressed in its thickness direction.
  • high density projections on the first and second fibrous layers inevitably increase the basis weight of these fibrous layers and deteriorate the flexibility of the composite sheet.
  • the breathable and liquid-impervious composite sheet including flexible, breathable and liquid-impervious thermoplastic synthetic resin film and heat-sealable fibrous nonwoven fabric layers placed upon opposite surfaces of the synthetic resin film, and obtained by heat-sealing the synthetic resin film and the fibrous nonwoven fabric layers together in the course of a heat treatment process including an embossing roll.
  • the improvement according to this invention is in that the synthetic resin film has a basis weight of 0.098 - 0.392 N/m 2 arid a thermal shrink percentage of 3 - 18 % under 60 °C ( ⁇ 5 °C) thermal atmosphere while the nonwoven fabric layers have a basis weight of 0.049 - 0.294 N/m 2 , wherein the sheet is formed with plural arrays of heat-sealed regions each extending in transverse direction of the composite sheet and spaced one from another in longitudinal direction intersecting the transverse direction and wherein, between each pair of the adjacent heat-sealed regions, the nonwoven fabric layers describe circular arcs which are convex outward in a thickness direction of the sheet from the opposite surfaces of the synthetic resin film.
  • the heat-sealed regions are arranged intermittently with spacings each of a given length in the transverse direction so that a length of each the heat-sealed region and a length of each the spacing in the transverse direction are in a relationship of the length of the heat-sealed region > the length of the spacing and wherein the spacings in one array of the heat-sealed regions are not aligned with the spacings in the array of heat-sealed region which is adjacent to the one array in the longitudinal direction of the composite sheet while the respective spacings in the one array of heat-sealed regions are aligned with the respective heat-sealed regions in the array which is adjacent to the one array so that, as viewed in the longitudinal direction, respective the heat-sealed regions as well as respective the spacings in these arrays are in a staggered relationship.
  • the composite sheet 1 has a relative hardness of 40 - 70 mm in the longitudinal direction as measured by the cantilever test.
  • the composite sheet has a compressive modulus of 70 - 95% in its region except the heat-sealed regions.
  • Fig. 1 is a perspective view of a composite sheet 1
  • Fig. 2 is a sectional view of the composite sheet 1 taken along line A - A in Fig. 1
  • Fig. 3 is a diagram illustrating relative positions of heat-sealed regions 4 in the composite sheet 1.
  • the composite sheet 1 is of a three-layered structure comprising a layer of flexible, breathable and liquid-impervious thermoplastic synthetic resin film 2 and two nonwoven fabric layers 3A, 3B each made of thermoplastic synthetic resin fiber and placed on opposite surfaces of the film 2, respectively.
  • the synthetic resin film 2 is thermally shrinkable in longitudinal direction X and transverse direction Y of the composite sheet 1, at least in the longitudinal direction X.
  • the direction referred to herein as the longitudinal direction X should be understood to be the direction extending in parallel to the circumferential direction defined by a peripheral surfaces of the embossing rolls 10, 20 as will be described later.
  • the direction referred to herein as the transverse direction Y should be understood to be the direction extending transversely of the circumferential direction defined by the peripheral surfaces of the embossing rolls 10, 20.
  • the composite sheet 1 is formed with a plurality of heat-sealed regions 4 arranged intermittently with spacings 5 each of a given length L2 in the transverse direction Y of the composite sheet 1. Each array of these heat-sealed regions 4 is spaced apart from the adjacent array of the heat-sealed regions 4 in the longitudinal direction X of the composite sheet 1.
  • a length L1 of each heat-sealed region 4 in the transverse direction Y is larger than the length L2 of each spacing in the direction Y, i.e., the length of the heat-sealed region > the length of the spacing.
  • the spacings 5A in one array of the heat-sealed region 4A are not aligned with the spacings 5B in the array of heat-sealed region 4B which is adjacent to the one array in the longitudinal direction X of the composite sheet 1.
  • the respective spacings 5A in the one array of heat-sealed region array 4A are aligned with the respective heat-sealed regions 4B in the array which is adjacent to the one array.
  • the respective heat-sealed regions 4A, 4B as well as the respective spacings 5A, 5B in these arrays are in a staggered relationship.
  • the heat-sealed regions 4A, 4b in each pair of the arrays being adjacent to each other in the longitudinal direction X are arranged so that transversely opposite ends 4A1 of the heat-sealed region 4A overlap transversely opposite ends 4B1 of the heat-sealed region 4B.
  • the nonwoven fabric layers 3A, 3B describe circular arcs which are convex outwardly in a thickness direction of the composite sheet 1, i.e., in the direction Z1.
  • the nonwoven fabric layers 3A, 3B are slightly spaced apart from the synthetic resin film 2 outward of the thickness direction, i.e., in the direction Z1, and extend substantially in parallel to the synthetic resin film 2.
  • the portions of the nonwoven fabric layers 3A, 3B extending between each pair of the adjacent heat-sealed regions 4 are compressively deformed against this pressure. Being relieved of this pressure, the nonwoven fabric layers 3A, 3B are spaced apart again from opposite surfaces of the synthetic resin film 2 so as to describe the circular arcs which are convex outward in the thickness direction, i.e., in the direction Z1.
  • the composite sheet 1 has a relative hardness of 40 ⁇ 70 mm in the longitudinal direction as measured by the cantilever test and a compressive modulus of 70 ⁇ 95 % in the region except the heat-sealed regions 4. Measurement of these relative hardness and the compressive modulus was conducted in according to JIS: L1096. The relative hardness exceeding 70 mm and the compressive modulus exceeding 95 % would unacceptably deteriorate a flexibility of the composite sheet 1. The relative hardness less than 40 mm and the compressive modulus less than 70 % would unacceptably deteriorate an elasticity of the composite sheet 1.
  • a dimension L3 by which each pair of the heat-sealed regions being adjacent in the longitudinal direction X are spaced apart from each other is preferably in a range of 1.5 ⁇ 7.0 mm.
  • the dimension L3 less than 1.5 mm would lead to formation of an excessive number of the heat-sealed regions 4. Consequently, the relative hardness of the composite sheet 1 would exceed the preferable range and the flexibility of the composite sheet 1 would be correspondingly deteriorated.
  • the dimension L3 exceeding 7.0 mm would unacceptably decrease the number of the heat-sealed regions 4 and peel strength as well as shape stability of the composite sheet 1 would be correspondingly deteriorated.
  • the synthetic resin film 2 preferably has a basis weight of 0.098 ⁇ 0.392 N/m 2 and a thickness of 20 ⁇ 30 ⁇ m.
  • the nonwoven fabric layers 3A, 3B preferably have a basis weight of 0.049 ⁇ 0.294 N/m 2 . It is assumed that the synthetic resin film has a basis weight less than 0.098 N/m 2 and a thickness less than 20 ⁇ m while the nonwoven fabric layers 3A, 3B have a basis weight of 0.049 N/m 2 .
  • both the synthetic resin film 2 and the nonwoven fabric layers 3A, 3B would have strength deteriorated and it is apprehended that troubles such as breakage and/or pinhole formation might occur in the heat-sealed regions 4 as the film 2 and nonwoven fabric layers 3A, 3B are heat-sealed together.
  • the synthetic resin film 2 has a basis weight exceeding 0.392 N/m 2 and a thickness exceeding 30 ⁇ m while the nonwoven fabric layers 3A, 3B have a basis weight exceeding 0.294 N/m 2
  • the composite sheet 1 would have a relative hardness exceeding the range and a flexibility correspondingly deteriorated.
  • the length L1 of the heat-sealed region 4 in the transverse direction Y is preferably in a range of 1.50 ⁇ 3.00 mm and the length L2 of the spacing 5 in the transverse direction Y is preferably 1.00 ⁇ 1.20 mm. Assumed that the length L1 is less than 1.50 mm and the length L2 exceeds 1.20 mm, the composite sheet 1 would have its peel strength and shape stability unacceptably deteriorated.
  • the nonwoven fabric layers 3A, 3B preferably have a height H of 0.05 ⁇ 0.20 mm as measured from their bottoms to their tops.
  • the height H less than 0.05 mm would prevent the nonwoven fabric layers 3A, 3B from being compressively deformed sufficiently and the compressive modulus of the composite sheet 1 would be less than the range.
  • the composite sheet 1 could not have a desired elasticity.
  • the height H exceeding 0.20 mm would increase a bulkiness of the composite sheet 1 and correspondingly increase a frictional drag of the composite sheet's surface.
  • Fig. 4 is a diagram illustrating an example of the process for making the composite sheet 1 (shown in Fig. 1) and Fig. 5 is a diagram illustrating another example of the process for making the composite sheet 1 (shown in Fig. 1).
  • the process illustrated in Fig. 4 includes an embossing roll 10 and a crown roll 11 opposed to the embossing roll 10 and a take-up roll 12 provided at downstream of these rolls 10, 11 to take up the finished composite sheet 1.
  • the embossing roll 10 and the crown roll 11 are rotated at an identical speed.
  • the take-up roll 12 is rotated at a speed slightly lower than the speed at which the embossing roll 10 and crown roll 11 are rotated.
  • the embossing roll 10 is formed on its peripheral surface with a plurality of projections 10a and the crown roll 11 has a flat peripheral surface.
  • the embossing roll 10 and the crown roll 11 are heated at a temperature of approximately 80 °C-approximately 110°C.
  • the projections 10a on the embossing roll 10 are arranged intermittently in the direction (i.e., transverse direction Y) transversely of the circumferential direction of the embossing roll 10 in a plurality of arrays.
  • the projections 10a in one array are aligned with the spacings in the array adjacent to the one array in the circumferential direction. In other words, the projections 10a in each pair of the adjacent array are in staggered relationship.
  • the synthetic resin film 2 being continuous in the longitudinal direction X and the nonwoven fabric layers 3A, 3B both being continuous in the longitudinal direction X are fed into a nip defined between the embossing roll 10 and the crown roll 11 so the nonwoven fabric layers 3A, 3B may be placed upon opposite surface of the synthetic resin film 2, respectively.
  • the synthetic resin film 2 and the nonwoven fabric layers 3A, 3B are heat-sealed together by the projections 10a of the embossing roll 10 and the peripheral surface of the crown roll 11 coming in contact with each other.
  • the thermal shrinkage of the synthetic resin film 2 causes the heat-sealed regions 4 get near one to another in the longitudinal direction X immediately after the synthetic resin film 2 and the nonwoven fabric layers 3A, 3B have been heat-sealed together and discharged from the nip of the rolls 10, 11. Between each pair of the adjacent heat-sealed regions 4, the nonwoven fabric layers 3A, 3B are not thermally shrinkable in spite of being heated by the rolls 10, 11.
  • the nonwoven fabric layers 3A, 3B describe a circular arc which is convex upward in the thickness direction of the composite sheet 1, i.e., in the direction Z1 between each pair of the adjacent heat-sealed regions 4 as the dimension L3 between these adjacent heat-sealed regions 4 is thermally shrunk.
  • the composite sheet 1 discharged from the nip between the embossing roll 10 and the crown roll 11 is cooled by heat dissipation and taken up on the take-up roll 12.
  • Rotary speed of the take-up roll 12 is lower than that of the embossing roll 10 and the crown roll 11 and therefore it is not apprehended that the thermally shrunk synthetic resin film 2 might be stretched by the take-up roll 12 in the longitudinal direction X.
  • the synthetic resin film 2 ceases to be thermally shrunk as it is cooled and is maintained in its shrunk condition.
  • This process includes an embossing roll 20 adapted to be rotated at a predetermined speed, an ultrasonic sealer 21, a heater 22 provided at downstream of the roll 20 to heat the composite sheet 1 and a take-up roll 23 provided at downstream of the heater 22 to take up the finished composite sheet 1.
  • the take-up roll 23 is rotated at a speed slightly lower than the speed at which the embossing roll 20 is rotated.
  • the embossing roll 20 is formed on its peripheral surface with a plurality of projections 20a.
  • the projections 20a on the embossing roll 20 are arranged with spacings each having a predetermined spacing intermittently in the direction (i.e., transverse direction Y) transversely of the circumferential direction of the embossing roll 20 in a plurality of arrays.
  • the projections 20a in one array are aligned with the spacings in the array adjacent to the one array in the circumferential direction (i.e., the longitudinal direction X) In other words, the projections 10a in each pair of the adjacent array are in staggered relationship.
  • An anvil 21a of the ultrasonic sealer 21 is adapted to come in contact with the projections 20a on the peripheral surface of the roll 20.
  • the synthetic resin film 2 being continuous in the longitudinal direction X and the nonwoven fabric layers 3A, 3B both being continuous in the longitudinal direction X are fed into a nip defined between the embossing roll 20 and the ultrasonic sealer 21 so that the nonwoven fabric layers 3A, 3B may be placed upon opposite surface of the synthetic resin film 2, respectively.
  • the synthetic resin film 2 and the nonwoven fabric layers 3A, 3B are heat-sealed together by the projections 20a of the embossing roll 20 and the anvil 21a of the ultrasonic sealer 21 coming in contact with each other.
  • the composite sheet 1 comprising the synthetic resin film 2 and the nonwoven fabric layers 3A, 3B heat-sealed together in this manner is then fed to the heater 22.
  • the composite sheet is subjected to hot blast at a temperature of approximately 100 °C - approximately 150 °C and thermally shrunk at the shrink percentage.
  • the thermal shrinkage of the synthetic resin film 2 causes the heat-sealed regions 4 get near one to another in the longitudinal direction X.
  • the nonwoven fabric layers 3A, 3B are not thermally shrinkable in spite of being heated by the heater 22.
  • the nonwoven fabric layers 3A, 3B describe a circular arc which is convex outward in the thickness direction of the composite sheet 1, i.e., in the direction Z1, between each pair of the adjacent heat-sealed regions 4 as the dimension L3 between these adjacent heat-sealed regions 4 is thermally shrunk.
  • the composite sheet 1 discharged from the heater 22 is cooled by heat dissipation and taken up on the take-up roll 23.
  • the synthetic resin film 2 ceases to be thermally shrunk as it is cooled and is maintained in its shrunk condition.
  • a thermal shrink percentage per unit area of the synthetic resin film 2 is in a range of 3 ⁇ 18 %, preferably in a range of 5 ⁇ 13 % under a thermal atmosphere at 60 °C ( ⁇ 5 °C). It is assumed now that the shrink percentage of the synthetic resin film 2 is less than 3 %. In this case, even if the synthetic resin film 2 is thermally shrunk to reduce the dimension L3 between each pair of the adjacent heat-sealed regions 4, the nonwoven fabric layers 3A, 3B could not sufficiently curved toward the direction Z1 to ensure an elasticity desired for the composite sheet 1. It is assumed, on the other hand, that the shrink percentage exceeds 18 %.
  • the synthetic resin film 2 may be made of low density polyethylene, linear low density polyethylene, intermediate density polyethylene or metallocene polyethylene.
  • the nonwoven fabric layers 3A, 3B may be formed with a nonwoven fabric of polyethylene fiber having the same composition as the synthetic resin film 2, for example, of spunbond-, spunlace-, needlepunch-, meltblown-, thermalbond- or chemicalbond-type.
  • Component fiber of these nonwoven fabric layers 3A, 3B may be selected from a group of core-sheath-type conjugated fiber of which the sheath is formed with polyethylene having the same composition as the synthetic resin film 2 and the core is formed with any one of polypropylene, polyester and polyethylene terephthalate.
  • the synthetic resin film 2 and the nonwoven fabric layers 3A, 3B may be formed with polyethylene being the same in composition as well as in melting point to facilitate these film 2 and nonwoven fabric layers 3A, 3B to be heat-sealed together.
  • nonwoven fabric layers 3A, 3B may be formed with polypropylene fiber of the same composition as the synthetic resin film 2.
  • the heat-sealed regions 4 have been described above with reference to the accompanying drawings to be arranged-intermittently in the transverse direction Y of the composite sheet 1. However, it is also possible to arrange these heat-sealed regions 4 so that they extend continuously in the transverse direction Y of the composite sheet 1.
  • the composite sheet 1 according to this invention is suitably used as the stock material for a disposable wearing article such as an outer gown for surgeon or a patient or nightgown for patient.
  • a disposable wearing article such as an outer gown for surgeon or a patient or nightgown for patient.
  • Such composite sheet 1 is applicable also as the stock material for a backsheet in a disposable diaper, a diaper cover, training pants or incontinent pants.
  • the breathable and liquid-impervious composite sheet proposed by this invention comprises the flexible, breathable and liquid-impervious synthetic resin film and the nonwoven fabric layers placed upon opposite surfaces of. the synthetic resin film, respectively.
  • the synthetic resin film has a thermal shrink percentage of 3 ⁇ 18 % per unit area under 60 °C ( ⁇ 5 °C) thermal atmosphere and, between each pair of the adjacent heat-sealed regions, the nonwoven fabric layers describe circular arcs which are convex outward in the thickness direction of the composite sheet from the opposite surfaces of the synthetic resin film. Under pressure exerted upon the composite sheet inward in the thickness direction, the respective nonwoven fabric layers are compressively deformed against the pressure. However, once relieved of the pressure, the nonwoven fabric layers restore their initial circular arcs which are convex outward in the thickness-direction from the opposite surfaces of the synthetic resin film.
  • the composite sheet has a relative hardness of 40 ⁇ 70 mm in the longitudinal direction and a compressive modulus of 70 ⁇ 95 % between each pair of the adjacent heat-sealed regions.
  • the synthetic resin film has a basis weight of 0.098 - 0.392 N/m 2 and the nonwoven fabric layers have a basis weight of 0.049 ⁇ 0.294 N/m 2 . Accordingly, the composite sheet has a thickness appropriately limited so as to ensure high elasticity and flexibility.

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  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dermatology (AREA)
  • Laminated Bodies (AREA)
  • Nonwoven Fabrics (AREA)
EP01303686A 2000-05-09 2001-04-23 Feuille composite respirable et imperméable Withdrawn EP1153737A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000135981A JP2001315268A (ja) 2000-05-09 2000-05-09 通気不透液性複合シート
JP2000135981 2000-05-09

Publications (2)

Publication Number Publication Date
EP1153737A2 true EP1153737A2 (fr) 2001-11-14
EP1153737A3 EP1153737A3 (fr) 2002-08-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01303686A Withdrawn EP1153737A3 (fr) 2000-05-09 2001-04-23 Feuille composite respirable et imperméable

Country Status (10)

Country Link
US (1) US20010041248A1 (fr)
EP (1) EP1153737A3 (fr)
JP (1) JP2001315268A (fr)
KR (1) KR20010106216A (fr)
CN (1) CN1322869A (fr)
AU (1) AU3510901A (fr)
BR (1) BR0101924A (fr)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002100632A1 (fr) * 2001-06-08 2002-12-19 Sca Hygiene Products Ab Stratifie fait de couches fibreuses
WO2005017248A1 (fr) * 2003-05-09 2005-02-24 Kimberly-Clark Worldwide, Inc. Etoffe barriere composite respirante non tissee
EP1783257A1 (fr) * 2005-11-08 2007-05-09 Aplix Stratifié non tisse-elastomère-non tissé
US7919169B2 (en) 2001-06-08 2011-04-05 Sca Hygiene Products Ab Laminate made of fibrous layers for use in absorbent articles
EP1689582B1 (fr) * 2003-12-03 2013-02-13 Gore Enterprise Holdings, Inc. Nouveaux films polymeres et lamines textiles contenant de tels films polymeres

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4443854B2 (ja) * 2003-04-28 2010-03-31 株式会社クラレ 透湿性エラストマーシート
JP4430338B2 (ja) * 2003-05-27 2010-03-10 ユニ・チャーム株式会社 吸収性物品
DE102004024042A1 (de) * 2004-05-07 2005-11-24 Paul Hartmann Ag Vlies-/Folienlaminat
JP4517888B2 (ja) * 2005-02-25 2010-08-04 東レ株式会社 移動用シート
JP2006263447A (ja) * 2005-02-25 2006-10-05 Toray Ind Inc 移動用シート及び移動用シートセット
US7323072B2 (en) * 2005-04-27 2008-01-29 Kimberly-Clark Worldwide, Inc. Multi-roll bonding and aperturing
US8679992B2 (en) * 2008-06-30 2014-03-25 Kimberly-Clark Worldwide, Inc. Elastic composite formed from multiple laminate structures
US8603281B2 (en) * 2008-06-30 2013-12-10 Kimberly-Clark Worldwide, Inc. Elastic composite containing a low strength and lightweight nonwoven facing
JP5139193B2 (ja) * 2008-07-31 2013-02-06 弘子 吉本 機能性シート
US20100199406A1 (en) 2009-02-06 2010-08-12 Nike, Inc. Thermoplastic Non-Woven Textile Elements
US20100199520A1 (en) * 2009-02-06 2010-08-12 Nike, Inc. Textured Thermoplastic Non-Woven Elements
US9682512B2 (en) 2009-02-06 2017-06-20 Nike, Inc. Methods of joining textiles and other elements incorporating a thermoplastic polymer material
JP5452949B2 (ja) * 2009-02-24 2014-03-26 ユニ・チャーム株式会社 ロール状シートの製造方法、及び、ロール状シートの製造装置
JP5606778B2 (ja) * 2010-04-22 2014-10-15 大倉工業株式会社 手術用資材
CN101983865A (zh) * 2010-08-31 2011-03-09 东莞市挚爱内衣有限公司 一种基于热熔胶无纺布复合的生产工艺
US9179783B2 (en) 2010-12-06 2015-11-10 Snell R&D, Llc Bed bug protection device
US20140144171A1 (en) * 2011-06-30 2014-05-29 Bha Altair, Llc Method of Wetting Evaporative Cooler Media Through a Fabric Distribution Layer
MX349179B (es) 2012-03-07 2017-07-17 Toyota Tekko Kk Componente interno de un material compuesto laminado.
JP5893218B2 (ja) 2013-05-15 2016-03-30 豊田鉄工株式会社 重ね合わせ複合内装部品
US9744083B2 (en) * 2013-10-04 2017-08-29 Kimberly-Clark Worldwide, Inc. Apertured outer cover for absorbent articles
CN109023709A (zh) * 2018-07-24 2018-12-18 浙江金三发非织造布有限公司 一种弹性超柔纺粘无纺布
JP6557440B1 (ja) * 2019-01-25 2019-08-07 三井化学株式会社 スパンボンド不織布、スパンボンド不織布の製造方法、エンボスロール
JP7257948B2 (ja) * 2019-12-27 2023-04-14 ユニ・チャーム株式会社 積層不織布

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3755062A (en) * 1971-07-21 1973-08-28 Grace W R & Co Fabric formed by heat sealing, shrinking and foaming backing
US4781966A (en) * 1986-10-15 1988-11-01 Kimberly-Clark Corporation Spunlaced polyester-meltblown polyetherester laminate
EP0327402A2 (fr) * 1988-02-05 1989-08-09 Tonen Chemical Corporation Feuille composite étanche à l'eau perméable au gaz
GB2285408A (en) * 1993-12-17 1995-07-12 Kimberly Clark Co Breathable polyolefin film and laminate
WO1997002130A1 (fr) * 1995-06-30 1997-01-23 Kimberly-Clark Worldwide, Inc. Stratifie tissu-film gonflant
US5883028A (en) * 1997-05-30 1999-03-16 Kimberly-Clark Worldwide, Inc. Breathable elastic film/nonwoven laminate
WO1999030904A1 (fr) * 1997-12-17 1999-06-24 Kimberly-Clark Worldwide, Inc. Film et stratifie formant barriere ameliores et leur procede de fabrication
US6037281A (en) * 1996-12-27 2000-03-14 Kimberly-Clark Worldwide, Inc. Cloth-like, liquid-impervious, breathable composite barrier fabric

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW343148B (en) * 1996-03-19 1998-10-21 Kao Corp Composite sheet, absorbent article and process for producing the same
JPH10295724A (ja) * 1997-04-25 1998-11-10 Uni Charm Corp 体液処理用吸収性物品

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3755062A (en) * 1971-07-21 1973-08-28 Grace W R & Co Fabric formed by heat sealing, shrinking and foaming backing
US4781966A (en) * 1986-10-15 1988-11-01 Kimberly-Clark Corporation Spunlaced polyester-meltblown polyetherester laminate
EP0327402A2 (fr) * 1988-02-05 1989-08-09 Tonen Chemical Corporation Feuille composite étanche à l'eau perméable au gaz
GB2285408A (en) * 1993-12-17 1995-07-12 Kimberly Clark Co Breathable polyolefin film and laminate
WO1997002130A1 (fr) * 1995-06-30 1997-01-23 Kimberly-Clark Worldwide, Inc. Stratifie tissu-film gonflant
US6037281A (en) * 1996-12-27 2000-03-14 Kimberly-Clark Worldwide, Inc. Cloth-like, liquid-impervious, breathable composite barrier fabric
US5883028A (en) * 1997-05-30 1999-03-16 Kimberly-Clark Worldwide, Inc. Breathable elastic film/nonwoven laminate
WO1999030904A1 (fr) * 1997-12-17 1999-06-24 Kimberly-Clark Worldwide, Inc. Film et stratifie formant barriere ameliores et leur procede de fabrication

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002100632A1 (fr) * 2001-06-08 2002-12-19 Sca Hygiene Products Ab Stratifie fait de couches fibreuses
US7919169B2 (en) 2001-06-08 2011-04-05 Sca Hygiene Products Ab Laminate made of fibrous layers for use in absorbent articles
WO2005017248A1 (fr) * 2003-05-09 2005-02-24 Kimberly-Clark Worldwide, Inc. Etoffe barriere composite respirante non tissee
EP1689582B1 (fr) * 2003-12-03 2013-02-13 Gore Enterprise Holdings, Inc. Nouveaux films polymeres et lamines textiles contenant de tels films polymeres
EP1783257A1 (fr) * 2005-11-08 2007-05-09 Aplix Stratifié non tisse-elastomère-non tissé
KR101300330B1 (ko) * 2005-11-08 2013-08-28 아플릭스 적층체 및 이 적층체의 제조 방법

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BR0101924A (pt) 2002-07-16
CN1322869A (zh) 2001-11-21
AU3510901A (en) 2001-11-15
CA2343636A1 (fr) 2001-11-09
EP1153737A3 (fr) 2002-08-21
SG85237A1 (en) 2001-12-19
ID30196A (id) 2001-11-15
KR20010106216A (ko) 2001-11-29
JP2001315268A (ja) 2001-11-13

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